Edward w



(No Model.)

E. W. BANDEN. MREGT ACTING AND coMP-oUND- ENGINE.

N0. 490,348. Patented Jan. 24, 1893.

:WW/J* Z1 2z r 77 l l /l/M mmmm @MMG/Zo@ EDWARD W. HARDEN, OF CINCINNATI, OHIO, ASSIGNOR 'IO FREDERIC O. WEIR, OF SAME PLACE.

DIRECT-ACTING AND COMPOUND ENGlNE.

SPECIFICATION forming part of Letters Patent No. 490,348, dated January 24, 1893. Application filed February 10 1892. Serial No. 421,035. (No modell To all whom it may concern: l 10 represents the packing rings on the cy- Be it known that I, EDWARD W. HARDEN, a lindrical extension of said piston. 5o citizen of the United States, residing at Oin- 11 represents a stuffing box for the piston cinnati, in the county of Hamilton and State rod 8; this rod is shown tapered at 12 anden- 5 of Ohio, have invented certain new and usegaging with the hub of the inside end 13 of ful Improvements in Direct-Acting and Comthe extension cylinder 3. pound Engines, of which the following is a B represents the main valve which in the 55 specification. construction here shown makes its full throw, My invention relates to acompound engine. the amount of steam being controlled by 1o he object of my invention is, first, to emthe auxiliary valve A hereinafter described. loy a differential piston inclosed in a differ- But it is obvious that this main valve may be ential cylinder with the valves so arranged used to operate automatically and cut oft 6o that the steam can be used either as a double without the use ot the auxiliary valve.

acting direct engine, or as a single acting a represents the steam port leading to the smaller piston area.

15 compound engine,by simply changing the pob represents a steam port leading to the larger piston area. 65

sition of the valve so as to bring the ditterent c, c represent ports leading to the ordinary exhaust chamber on one side of the steam chest.

e represents the live steam port ofthe main valve; this valve is provided with ports d, d', 7o on each side of the live steam port c. Port d is for exhausting steam into port c and is only used when the engine is working as a double acting simple engine. It is shown in proper position for exhausting in Fig. 4. The 7 5 port d is used for exhausting the steam compounded; it is also used for connecting port a with port b for directing steam from the smaller piston on to the larger area for being compounded. It is also used for ex- 8o hausting steam from the larger piston when it works only as double acting simple engine.

It is shown in Fig. 1 in position for exhaustling the steam which has been compounded on the larger piston. In Fig. 2 it is shown in 85 position for receiving the steam trom the port o., and directing it through port b for My invention relates further to details of construction which will be fully set forth in zo the description of the accompanying drawings making a part of this specification, in which- Figure 1 is a central sectional elevation of the piston, cylinder, and steam valve. Fig.

2 is a similar view ot the steam chest and 25 ports showing the position of the valves when compounding the steam. Fig. 3 is a similar view showing the position of the valves for directing the steam on to the smaller piston #i while it is exhausting from the piston side.v

" 3o Fig. 4 shows the opposite position of the valve for directing steam on to the larger piston and exhausting from the opposite side. Fig.

. 5, represents an end section of the steam chamber and auxiliary valve.

3 5 In the accompanying drawings, l repref sents the steam piston, 2 the cylinder in which Y the said piston travels. 3 represents a cyj' lindrical extension of said piston 1, and-i the cylinder in which 'said cylinder 3 recipro- 4o cates. compounding. V;- 5 represents a head closing the end of the When the valve B is in position shown in smaller cylinder. Fig. 1 it is directing live steam on to the 9o 6 represents the opposite head for closing smaller piston in one stroke, and the opposite the front end of the cylinder. The said pisoperation is shown in Fig. 2, the steam being l' 45 ton 1 and the cylinder 3 are preferably made conveyed to the opposite end or larger area of two pieces and mounted upon piston rod 8. for compounding. Now, it it is desired to 9 represents the packing rings on the main change the engine from a compound to a 95 l .n piston. simple acting engine this valve Bis moved l. In combination with adifterential cylinder having the ports ct, b, c', and a piston, of the main valve B provided with the live steam port e, and the port- CZ, for the ports a, Z9, c in the steam chest, Whei'eby direct steam longitudinally forward on its stem so that in its forward position the live steam porte Will be under the port z' in the valve seat F, as shown in Fig. 4. This is the forward position of the valve h when it is acting as a simple engine. And Fig. 3 shows the rear position is admitted to the lesser piston of the valve. Fig. l shows the forward posiarea, and compounded upon the larger pistion of the valve when it is acting as a comton area, and then exhausted, substantially as pound engine, and Fig 2 shows the ieai pospecified.

2. In combination with inder of an engine, provided with the ports To accomplish this result I preferably mount the valve on the stem C, which projects forward through the steam chest. In order that the position of this valve may be 3. In combination with the differential cylglance, and also readily adinder of an engine, provided witlithe ports b, and the ports c, c', the main valve B provided with live steam port e, and the ports d, d', on either side thereof, and mechanism for adjustingsaidvalvelongit allyon its seat,

the sleeve journal I6 to which it is splined. 17 represents a hand wheel rigidly secured to this journal 16; hand wheel is turned it revolves the journal being feathered thereto turns with it, and the inner part is screw compound to substantially as specified.

4. In combination with the differential cylinder of an engine, the valve B provided with the ports e, d and d', the upper valve seat proand this movevided with two live steam ports with which ment may be made while the valve is in mo- And when the auxiliary valve is em- A ployed this is more readily accomplished as the valve is making its full throw all the time. aworm on the hub of said joursubstantially as specified.

In combin'ation with the differential piston of a steam engine, the valve B provided with the live steam porte, and the ports CZ CZ', formed in the under face of the valve, and with two cut-oliis formed whereby live steam is admitted `on to the smaller piston and compounded on the larger piston, substantially as specified.

In a steam engine, the combination with a cylinder having' ports, of steam port c, and the ports CZ, cZ, in front and rear of the cutoffs for port a, and mounted upon the valve projecting through the steam chest, and mechanism for revolving said piston rod valve to the engineer. is moved preferably by an jointed to the valve prefer to employ a ball joint23 for connecting the valve rod to the eccentric rod.

As shown in Fig. 5, the letter A represents the steam chamber, and A, the auxiliary valve arranged therein. t, t, represent the eccentric rod openings into the shell of the valve. s, s, to adjust the valve on its seat, and an indirepresent recess ports in the upper seat F, for cator connected to said adjusting device, balancing the valve; F', represents the lower whereby the position of the valve is at all seat, fr, r, represent the lower ports with which indicated substantially as specified.

the parts z and e communicate. v, n, represent the upper and lower ports through the shell of the valve A.

The advantages of the construction shown herein are nu uierous. The differential piston is inclosed at all times and in this respect an improvement over the ordinary trunk cylinders and pistons. The engine can be readily converted from a direct acting to a compound 8. In combination with a steam engine havand vice-versa bysimply shifting the position ing the steam ports a, ZJ, and the exhaust of the main valve B. AndIbelieve I am the ports c, c', of the valve B havingasingle live steam port e, and two connecting and exhaust ports cl, and d', and an upper valve seat having two ports whereby steam is admitted ala and b, or interchangesubstantially as the same. valve.

Having described my invention, claim iswhat I ternately to the ports IOC IlO

ably to the port a alone, substantially as specifled.

9. In a steam engine the combination of a cylinder provided with ports, a main valve having ports to communicate with the ports in the cylinder, a valve A of hollow shell grid-iron form, said valve reciprocating so as to open ports on its seat at each end of its stroke, and means for adjusting the said main Valve to convert said engine into a sim- 1o ple or compound engine, substantially as described.

In testimony whereof I have hereunto set my hand.

EDWARD W. HARDEN. Witnesses:

T. SIMMONS, C. W. MILES. 

